How many moles ?

Question

How many moles of C₆H₁₂O₆ are needed to produce 22.78 grams of CO₂? Round your answer to three digits after the decimal point.

C₆H₁₂O₆ + 6 O₂ = 6 CO₂ + 6 H₂O

Answer 1

C₆H₁₂O₆ + 6 O₂ = 6 CO₂ + 6 H₂O .. balanced equation

mols CO₂ desired = 22.78 g CO₂ x 1 mol CO₂ / 44.01 g = 0.5176 mols CO₂

mass C₆H₁₂O₆ needed = 0.5176 mol CO₂ x 1 mol C₆H₁₂O₆/6 mol CO₂ x 180.16 g/mol = 15.542 g C₆H₁₂O₆

As an aside, asking to round the answer to 3 digits after the decimal is inane, as none of the values in the original question has such accuracy.